As far as the postcard goes, I’m afraid there doesn’t seem to be much to it beyond what you can see in the picture I already posted. I haven’t really been paying attention to any of the Descent of the Durtle stuff, though, so maybe you can find something I’m missing?
Here’s the back:
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And here’s the card held up to a bright light (much to the confusion of our dog, who watched me standing on a chair to take these):
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I even tried heating it with a hair dryer :s…